/Engine/Source/Runtime/Landscape/Classes/Materials/MaterialExpressionLandscapePhysicalMaterialOutput.h
Custom output node to write out physical material weights. This can be used to generate the dominant physical material for each point on a landscape. Note that the use of a material output node to generate this information is optional and when a node of this type is not present we fall back on a CPU path which analyzes landscape layer data.
class UMaterialExpressionLandscapePhysicalMaterialOutput : public [UMaterialExpressionCustomOutput](API\Runtime\Engine\Materials\UMaterialExpressionCustomOutput)
TArray<FPhysic...
Inputs
Array of physical material inputs.